linux-kernel - [PATCH v2 6/8] nvmem: rockchip-otp: Improve probe error handling

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Date:   Thu,  4 May 2023 23:06:46 +0300
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Shreeya Patel <shreeya.patel@...labora.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        Finley Xiao <finley.xiao@...k-chips.com>,
        Vincent Legoll <vincent.legoll@...il.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: [PATCH v2 6/8] nvmem: rockchip-otp: Improve probe error handling

Enhance error handling in the probe function by making use of
dev_err_probe(), which ensures the error code is always printed, in
addition to the specified error message.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Tested-by: Vincent Legoll <vincent.legoll@...il.com>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
---
 drivers/nvmem/rockchip-otp.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/nvmem/rockchip-otp.c b/drivers/nvmem/rockchip-otp.c
index 439aea1f8874..84bf956cc4e1 100644
--- a/drivers/nvmem/rockchip-otp.c
+++ b/drivers/nvmem/rockchip-otp.c
@@ -235,10 +235,8 @@ static int rockchip_otp_probe(struct platform_device *pdev)
 	int ret, i;
 
 	data = of_device_get_match_data(dev);
-	if (!data) {
-		dev_err(dev, "failed to get match data\n");
-		return -EINVAL;
-	}
+	if (!data)
+		return dev_err_probe(dev, -EINVAL, "failed to get match data\n");
 
 	otp = devm_kzalloc(&pdev->dev, sizeof(struct rockchip_otp),
 			   GFP_KERNEL);
@@ -249,7 +247,8 @@ static int rockchip_otp_probe(struct platform_device *pdev)
 	otp->dev = dev;
 	otp->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(otp->base))
-		return PTR_ERR(otp->base);
+		return dev_err_probe(dev, PTR_ERR(otp->base),
+				     "failed to ioremap resource\n");
 
 	otp->clks = devm_kcalloc(dev, data->num_clks, sizeof(*otp->clks),
 				 GFP_KERNEL);
@@ -261,18 +260,22 @@ static int rockchip_otp_probe(struct platform_device *pdev)
 
 	ret = devm_clk_bulk_get(dev, data->num_clks, otp->clks);
 	if (ret)
-		return ret;
+		return dev_err_probe(dev, ret, "failed to get clocks\n");
 
 	otp->rst = devm_reset_control_array_get_exclusive(dev);
 	if (IS_ERR(otp->rst))
-		return PTR_ERR(otp->rst);
+		return dev_err_probe(dev, PTR_ERR(otp->rst),
+				     "failed to get resets\n");
 
 	otp_config.size = data->size;
 	otp_config.priv = otp;
 	otp_config.dev = dev;
-	nvmem = devm_nvmem_register(dev, &otp_config);
 
-	return PTR_ERR_OR_ZERO(nvmem);
+	nvmem = devm_nvmem_register(dev, &otp_config);
+	if (IS_ERR(nvmem))
+		return dev_err_probe(dev, PTR_ERR(nvmem),
+				     "failed to register nvmem device\n");
+	return 0;
 }
 
 static struct platform_driver rockchip_otp_driver = {
-- 
2.40.0